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Titanium white waste acid concentration process

A titanium dioxide waste acid and process technology, which is applied in sulfur trioxide/sulfuric acid, inorganic chemistry, non-metallic elements, etc., can solve the problems of high reaction environment requirements, acid-corrosion equipment, and high equipment requirements, so as to reduce energy consumption. The effect of low consumption, difficult equipment and simple process

Inactive Publication Date: 2015-04-29
GUIZHOU LANXIN GRAPHITE MECHANICAL & ELECTRICAL EQUIP MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods all need to be evaporated at a higher temperature and then cooled and crystallized at a lower temperature, which has higher requirements on the reaction environment and equipment, and the acid is easy to corrode the equipment, high energy consumption, and high cost per ton of acid. Multi-stage steam concentration can easily lead to heater blockage due to impurities in waste acid. Therefore, it is of practical significance to study a waste acid concentration process with low energy consumption and high concentration of waste acid after concentration.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A process for concentrating titanium dioxide waste acid, comprising the following steps:

[0027] 1. Add sulfuric acid with a concentration of 75% to the waste acid with a concentration of 20%-23% produced by the sulfuric acid method to produce titanium dioxide, and adjust the concentration of sulfuric acid in the waste acid to 55%;

[0028] 2. Let the waste acid with a concentration of 55% stand at 55°C until the ferrous sulfate crystals no longer precipitate;

[0029] 3. Separate the ferrous sulfate crystals from the acid solution, take the acid solution, and add ozone at room temperature until the Fe in the acid solution 2+ All oxidized to Fe 3+ ;

[0030] 4. Add the oxidized acid solution, hydrochloric acid with a concentration of 3.5g / L and methyl isobutyl ketone with a concentration of 40% in sequence in the separatory funnel, vibrate, stand still, and layer, and take the upper layer after layering For the raffinate phase, add methyl isobutyl ketone with a conc...

Embodiment 2

[0034] A process for concentrating titanium dioxide waste acid, comprising the following steps:

[0035] 1. Add sulfuric acid with a concentration of 90% to the waste acid with a concentration of 20%-23%, and adjust the concentration of sulfuric acid in the waste acid to 60%;

[0036] 2. Let the waste acid with a concentration of 60% stand at 80°C until the ferrous sulfate crystals no longer precipitate;

[0037] 3. Separate the ferrous sulfate crystals from the acid solution, take the acid solution, and add ozone at room temperature until the Fe in the acid solution 2+ All oxidized to Fe 3+ ;

[0038] 4. Add the oxidized acid solution, hydrochloric acid with a concentration of 6.0g / L and methyl isobutyl ketone with a concentration of 60% in sequence in the separatory funnel, vibrate, stand still, and layer, and take the upper layer after layering For the raffinate phase, add methyl isobutyl ketone with a concentration of 60%, oscillate, stand still, and separate layers;

...

Embodiment 3

[0042] A process for concentrating titanium dioxide waste acid, comprising the following steps:

[0043] 1. Add sulfuric acid with a concentration of 60% to the waste acid with a concentration of 20%-23%, and adjust the concentration of sulfuric acid in the waste acid to 35%;

[0044] 2. Let the waste acid with a concentration of 35% stand at 40°C until the ferrous sulfate crystals no longer precipitate;

[0045] 3. Separate the ferrous sulfate crystals from the acid solution, take the acid solution, and add ozone at room temperature until the Fe in the acid solution 2+ All oxidized to Fe 3+ ;

[0046] 4. Add the oxidized acid solution, hydrochloric acid with a concentration of 1.0g / L-6.0g / L and methyl isobutyl ketone with a concentration of 20%-60% in sequence in the separating funnel, shake, stand still, and separate Layer, take the upper raffinate phase after layering, add methyl isobutyl ketone with a concentration of 20%-60%, shake, stand still, and layer;

[0047] 5. T...

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PUM

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Abstract

The invention discloses a titanium white waste acid concentration process. During the process, sulfuric acid with relatively high concentration is added into waste acid firstly, so as to enable ferrite to be separated out partly, an acid liquor and the separated out ferrite are separated, ozone is introduced into the acid liquor, ferrous ions are oxidized to be ferric ions, then the ferric ions are taken out through extraction and reextraction, and finally, the sulfuric acid with the concentration of 75 to 85 percent is obtained through atmospheric distillation and reduced pressure distillation. The titanium white waste acid concentration process provided by the invention is not required to be conducted in a high temperature environment, is free from high energy consumption, and is simple in process, low in cost and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a process for concentrating titanium white waste acid, which belongs to the technical field of waste acid treatment. Background technique [0002] At present, the global output value of titanium dioxide is about 11 billion US dollars, which is the third largest inorganic chemical product after synthetic ammonia and phosphoric acid. Titanium dioxide is widely used in coatings, paints, papermaking, rubber and other industries, and is closely related to people's basic necessities of life. Many countries have listed titanium dioxide as a key product that affects the development of the national economy, and per capita consumption of titanium dioxide is also regarded as an important indicator that reflects the level of a country's economic development. [0003] Correspondingly, the production of titanium dioxide mainly adopts three methods: sulfuric acid method, chlorination method and hydrochloric acid method. In my country, 95% of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/90
CPCC01B17/901C01B17/88C01B17/902
Inventor 杨颖
Owner GUIZHOU LANXIN GRAPHITE MECHANICAL & ELECTRICAL EQUIP MFG
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